If you are New on Ubuntu and you Try to Gain Access as the Root User you will Find your Way Barred…
This Because to Enable the Root User you Must First, Set His Password!
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Open a Terminal Window
(Press “Enter” to Execute Commands) - To Set the Root User Password Execute these Commands
sudo su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Insert your Passwordpasswd root
Set the Root Password